Picrylsulfonic Acid Solution Picrylsulfonic acid, also known as trinitrophenylsulfonic acid (TNPSA), is an aromatic sulfonic acid that is typically found as a yellow, crystalline solid or in aqueous solution. This compound is notable for its strong acidic properties and is widely used in chemical research, analytical chemistry, and as a reagent in various applications. Application... https://scienceandlaboratoryexp.com/product/picrylsulfonic-acid-solution/